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I would be more suspicious of the stock than the incubator. Too many people have success with the LG units, even limted success, to write the incubator off. And your conditions were pretty much spot on. I dont endorse the 9200, as there are other models that are superior IMHO. But they have stood the test of time, and I have had success with them.
Now, PC is right; you need to upgrade both your temp and humidity monitoring devices. A good digitherm and separate hygrometer is money well spent. More than a few hatches have gone off badly, thanks to those all-in-one weather units people are so fond of.
Just go to ebay and look up digital thermometer and hygrometer. Youll find plenty of decent reptile, aquarium and other offerings to meet your need. I use an aqurium digitherm with remote probe and a cigar hygrometer - I dont have over $25 in the two of them, combined
But what concerns me is the statement that your friend gave you "almost all fertile eggs." How do you know? What do you know about the way the breeding was conducted? Or how the eggs were handled after they were laid?
(On a side note, if your friend has a way to assure fertility before development, I'd sure like to hear about it. I may have some money to invest.
)
As for "Arabians', I'm assuming those were shipped eggs from someone here at BYC? The matter of shipped eggs includes the same questions posed about your friends eggs, WITH the additional worries over handling and treatment in transit.
More hatching troubles stem from poor treatment of the parent stock and egg handling than we know. I recommend you look there first.